TY - JOUR PB - American Physical Society ID - 10.1103/Physics.3.77 TI - Speeding up in a crowd JF - Physics JA - Physics J1 - PHYSICS VL - 3 IS - SP - 77 EP - PY - 2010/09/13/ UR - http://link.aps.org/doi/10.1103/Physics.3.77 A1 - Zhou, Huan-Xiang ER -